Founder and chairman of eBay, Pierre Omidyar ranks #57 on the Forbes 400, worth $7.5 billion. Last year, Mr. Omidyar donated 2.4 percent of his wealth, a collective $180 million to: the Democracy Fund, an organization started by Omidyar and his wife to combat extreme partisanship in politics and public discourse; HopeLab, a nonprofit that develops technology to help critically ill children; Humanity United, which supports efforts to fight slavery and mass atrocities around the globe; and the Ulupono Initiative, a Honolulu charity the supports groups focused on the environment, local agriculture, and sustainable energy.
Tim Shaffer/Reuters/File
